Just stating the obvious that not buying one of these things that we never seemed to need until they told us we needed it is the only way to have "the environment in mind".
I never thought I needed one until my wife lost her car keys, and the Fiat dealer charged $1,200 for a replacement.
And it's not even the electronics that makes them so expensive. Modern car keys aren't like the 1970's where it's just a piece of metal with the edges shaved off. Those little key cutting kiosks at Home Depot can't cope with today's complex engraving.
They do require periodic battery replacements but I imagine it’s still a net savings or pretty negligible cost. I’d love to see a more formal analysis, though.
Found the guy who literally never leaves his studio apartment and has thus never lost baggage, keys, etc.